#pragma once

#include <iostream>
#include <cstring>
#include <string>
#include <functional>
#include <memory>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "Common.hpp"
#include "Log.hpp"
#include "InetAddr.hpp"

using namespace LogModule;

using func_t = std::function<std::string(const std::string&)>;

const static int gsockfd = -1;
// const std::string gdefaultip = "127.0.0.1"; // 本地环回地址
const uint16_t gdefaultport = 8080; 

class UdpServer
{
public:
    UdpServer(func_t func, const uint16_t port = gdefaultport)
    :_sockfd(gsockfd)
    ,_addr(port)
    ,_isrunning(false)
    ,_func(func)
    {}

    void InitServer()
    {
        // 1.创建套接字
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            Die(SOCKET_ERR);
        }
        LOG(LogLevel::INFO) << "socket success, sockfd is: " << _sockfd;

        // 2.填充网络信息并绑定
        // struct sockaddr_in local;
        // bzero(&local, sizeof(local));
        // local.sin_family = AF_INET;
        // local.sin_port = ::htons(_port);
        // local.sin_addr.s_addr = ::inet_addr(_ip.c_str());
        // local.sin_addr.s_addr = INADDR_ANY;

        int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
            Die(BIND_ERR);
        }
        LOG(LogLevel::INFO) << "bind success";
    }

    void Start()
    {
        _isrunning = true;
        while (true)
        {
            char inbuffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer)-1, 0, CONV(&peer), &len); 
            if (n > 0)
            {
                inbuffer[n] = 0;
                // std::string clientip = ::inet_ntoa(peer.sin_addr);
                // uint16_t clientport = ::ntohs(peer.sin_port);
                InetAddr cli(peer);

                std::string clientinfo = cli.Ip() + ":" + std::to_string(cli.Port()) + " # " + inbuffer;
                LOG(LogLevel::INFO) << clientinfo;

                std::string echo_string = _func(inbuffer);
                
                // std::string echo_string = "echo# ";
                // echo_string += inbuffer;
                ::sendto(_sockfd, echo_string.c_str(), echo_string.size(), 0, CONV(&peer), sizeof(peer));
            }

        } 
        _isrunning = false;
    }

    ~UdpServer()
    {
        if (_sockfd > gsockfd)
            ::close(_sockfd);
    }
private:
    int _sockfd;        // 创建socket返回的fd
    InetAddr _addr;     
    // std::string _ip;    // 服务器IP
    // uint16_t _port;     // 服务器端口号
    bool _isrunning;    // 服务是否启动

    func_t _func;
};